I have not seen this ending used for the 3rd person plural perfect tense before, wouldn't it normally be "conticuerunt"? I almost took it to be the infinitive at first but it is definitely the perfect stem being used (contic..). Is this a common ending, as I can't see it in my textbooks?

And remember, there is another alternative form. "Vocaverunt" may therefore be written as "Vocavere" ánd "Vocarunt". I. e.: the "-ve"-part being removed. This omission may be extended to whatever possible form -> vocavero = vocaro, etc.